Fix Helm integration instructions.
Fix Helm integration instructions.

I did some experimentation using Docker for Mac Edge (bleeding edge)
which includes a Kubernetes cluster and added those instructions,
plus I found a few problems/improvements:

* For some reason a direct `helm install` of the generated chart
  fails to also install the habitat-operator/habitat-operator into
  K8S. I had to manually install it first. Maybe this is a bug...
* We can export the .hart off the depot directly into a Helm chart,
  thus saving the user from having to clone core-plans and compile
  anything

Signed-off-by: Julian C. Dunn <4730376567945fe1299889de81539a66f8d09104@chef.io>

georgemarshall/habitat,nathenharvey/habitat,georgemarshall/habitat,georgemarshall/habitat,georgemarshall/habitat,rsertelon/habitat,georgemarshall/habitat,habitat-sh/habitat,nathenharvey/habitat,rsertelon/habitat,georgemarshall/habitat,habitat-sh/habitat,nathenharvey/habitat,rsertelon/habitat,habitat-sh/habitat,georgemarshall/habitat,nathenharvey/habitat,habitat-sh/habitat,habitat-sh/habitat,rsertelon/habitat,nathenharvey/habitat,habitat-sh/habitat,habitat-sh/habitat,rsertelon/habitat,rsertelon/habitat,habitat-sh/habitat,georgemarshall/habitat,nathenharvey/habitat,rsertelon/habitat